What is the difference between 1080i 59.94 and 1080p 23.98 ??

Question

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Answer 1

1080i means 1080 lines of resolution displayed in an interlaced fashion. Which is to say at 60 frames per second (or 59.94 frames per second in this case) 30 frames are the even scan lines and 30 are the odd scan lines and they alternate between them when displayed. Primarily you are talking about sources and not display devices because LCD, Plasma and fixxed pixel projectors are all progressive scan and not interlaced. CRT and CRT projection TVs are interlaced but pretty rare now.

While these devices do a fine job they are they are improved upon by 1080P TVs and source devices. These show all 1080 lines every frame of the 60 displayed each second.

In both cases the TV or source device has to convert movies frame rate which is 24 frames per second (or in this case 23.98) to the 60 frames per second that the TV displays. Any conversion process introduces the possibility of errors so TVs that can display the 24 frames per second natively enjoy an advantage. The best chance for this is a TV that has a 120Hz refresh rate because 120 is divisible by both 60 and 24 so these TVs do fine with both film and TV framerates.

Specifically some devices native framerates are slightly off the standard 60Hz or 24Hz and so High end scalers like the IScan 50pro can shift the desired framerate to an exact framerate of the display device.

What you saw is probably that more exact native framerate specification. Most manufacturers just round it off at 24fps or 60fps.